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39
40#include <QtMultimedia/private/qtmultimediaglobal_p.h>
41#include "camerabinvideoencoder.h"
42#include "camerabinsession.h"
43#include "camerabincontainer.h"
44#include <private/qgstutils_p.h>
45
46#include <QtCore/qdebug.h>
47
48QT_BEGIN_NAMESPACE
49
50CameraBinVideoEncoder::CameraBinVideoEncoder(CameraBinSession *session)
51 :QVideoEncoderSettingsControl(session)
52 , m_session(session)
53#if QT_CONFIG(gstreamer_encodingprofiles)
54 , m_codecs(QGstCodecsInfo::VideoEncoder)
55#endif
56{
57}
58
59CameraBinVideoEncoder::~CameraBinVideoEncoder()
60{
61}
62
63QList<QSize> CameraBinVideoEncoder::supportedResolutions(const QVideoEncoderSettings &settings, bool *continuous) const
64{
65 if (continuous)
66 *continuous = false;
67
68 QPair<int,int> rate = rateAsRational(settings.frameRate());
69
70 //select the closest supported rational rate to settings.frameRate()
71
72 return m_session->supportedResolutions(rate, continuous, mode: QCamera::CaptureVideo);
73}
74
75QList< qreal > CameraBinVideoEncoder::supportedFrameRates(const QVideoEncoderSettings &settings, bool *continuous) const
76{
77 if (continuous)
78 *continuous = false;
79
80 QList< qreal > res;
81
82 const auto rates = m_session->supportedFrameRates(frameSize: settings.resolution(), continuous);
83 for (const auto &rate : rates) {
84 if (rate.second > 0)
85 res << qreal(rate.first)/rate.second;
86 }
87
88 return res;
89}
90
91QStringList CameraBinVideoEncoder::supportedVideoCodecs() const
92{
93#if QT_CONFIG(gstreamer_encodingprofiles)
94 return m_codecs.supportedCodecs();
95#else
96 return QStringList();
97#endif
98}
99
100QString CameraBinVideoEncoder::videoCodecDescription(const QString &codecName) const
101{
102#if QT_CONFIG(gstreamer_encodingprofiles)
103 return m_codecs.codecDescription(codec: codecName);
104#else
105 Q_UNUSED(codecName)
106 return QString();
107#endif
108}
109
110QVideoEncoderSettings CameraBinVideoEncoder::videoSettings() const
111{
112 return m_videoSettings;
113}
114
115void CameraBinVideoEncoder::setVideoSettings(const QVideoEncoderSettings &settings)
116{
117 if (m_videoSettings != settings) {
118 m_actualVideoSettings = settings;
119 m_videoSettings = settings;
120 emit settingsChanged();
121 }
122}
123
124QVideoEncoderSettings CameraBinVideoEncoder::actualVideoSettings() const
125{
126 return m_actualVideoSettings;
127}
128
129void CameraBinVideoEncoder::setActualVideoSettings(const QVideoEncoderSettings &settings)
130{
131 m_actualVideoSettings = settings;
132}
133
134void CameraBinVideoEncoder::resetActualSettings()
135{
136 m_actualVideoSettings = m_videoSettings;
137}
138
139
140QPair<int,int> CameraBinVideoEncoder::rateAsRational(qreal frameRate) const
141{
142 if (frameRate > 0.001) {
143 //convert to rational number
144 QList<int> denumCandidates;
145 denumCandidates << 1 << 2 << 3 << 5 << 10 << 25 << 30 << 50 << 100 << 1001 << 1000;
146
147 qreal error = 1.0;
148 int num = 1;
149 int denum = 1;
150
151 for (int curDenum : qAsConst(t&: denumCandidates)) {
152 int curNum = qRound(d: frameRate*curDenum);
153 qreal curError = qAbs(t: qreal(curNum)/curDenum - frameRate);
154
155 if (curError < error) {
156 error = curError;
157 num = curNum;
158 denum = curDenum;
159 }
160
161 if (curError < 1e-8)
162 break;
163 }
164
165 return QPair<int,int>(num,denum);
166 }
167
168 return QPair<int,int>();
169}
170
171#if QT_CONFIG(gstreamer_encodingprofiles)
172
173GstEncodingProfile *CameraBinVideoEncoder::createProfile()
174{
175 QString codec = m_actualVideoSettings.codec();
176 GstCaps *caps = !codec.isEmpty() ? gst_caps_from_string(string: codec.toLatin1()) : nullptr;
177
178 if (!caps)
179 return nullptr;
180
181 QString preset = m_actualVideoSettings.encodingOption(QStringLiteral("preset")).toString();
182 GstEncodingVideoProfile *profile = gst_encoding_video_profile_new(
183 format: caps,
184 preset: !preset.isEmpty() ? preset.toLatin1().constData() : NULL, //preset
185 NULL, //restriction
186 presence: 1); //presence
187
188 gst_caps_unref(caps);
189
190 gst_encoding_video_profile_set_pass(prof: profile, pass: 0);
191 gst_encoding_video_profile_set_variableframerate(prof: profile, TRUE);
192
193 return (GstEncodingProfile *)profile;
194}
195
196#endif
197
198void CameraBinVideoEncoder::applySettings(GstElement *encoder)
199{
200 GObjectClass * const objectClass = G_OBJECT_GET_CLASS(encoder);
201 const char * const name = qt_gst_element_get_factory_name(element: encoder);
202
203 const int bitRate = m_actualVideoSettings.bitRate();
204 if (bitRate == -1) {
205 // Bit rate is invalid, don't evaluate the remaining conditions.
206 } else if (g_object_class_find_property(oclass: objectClass, property_name: "bitrate")) {
207 g_object_set(G_OBJECT(encoder), first_property_name: "bitrate", bitRate, NULL);
208 } else if (g_object_class_find_property(oclass: objectClass, property_name: "target-bitrate")) {
209 g_object_set(G_OBJECT(encoder), first_property_name: "target-bitrate", bitRate, NULL);
210 }
211
212 if (qstrcmp(str1: name, str2: "theoraenc") == 0) {
213 static const int qualities[] = { 8, 16, 32, 45, 60 };
214 g_object_set(G_OBJECT(encoder), first_property_name: "quality", qualities[m_actualVideoSettings.quality()], NULL);
215 } else if (qstrncmp(str1: name, str2: "avenc_", len: 6) == 0) {
216 if (g_object_class_find_property(oclass: objectClass, property_name: "pass")) {
217 static const int modes[] = { 0, 2, 512, 1024 };
218 g_object_set(G_OBJECT(encoder), first_property_name: "pass", modes[m_actualVideoSettings.encodingMode()], NULL);
219 }
220 if (g_object_class_find_property(oclass: objectClass, property_name: "quantizer")) {
221 static const double qualities[] = { 20, 8.0, 3.0, 2.5, 2.0 };
222 g_object_set(G_OBJECT(encoder), first_property_name: "quantizer", qualities[m_actualVideoSettings.quality()], NULL);
223 }
224 } else if (qstrncmp(str1: name, str2: "omx", len: 3) == 0) {
225 if (!g_object_class_find_property(oclass: objectClass, property_name: "control-rate")) {
226 } else switch (m_actualVideoSettings.encodingMode()) {
227 case QMultimedia::ConstantBitRateEncoding:
228 g_object_set(G_OBJECT(encoder), first_property_name: "control-rate", 2, NULL);
229 break;
230 case QMultimedia::AverageBitRateEncoding:
231 g_object_set(G_OBJECT(encoder), first_property_name: "control-rate", 1, NULL);
232 break;
233 default:
234 g_object_set(G_OBJECT(encoder), first_property_name: "control-rate", 0, NULL);
235 }
236 }
237}
238
239QT_END_NAMESPACE
240

source code of qtmultimedia/src/plugins/gstreamer/camerabin/camerabinvideoencoder.cpp